Power control for communications systems utilizing high speed shared channels

Abstract

A system, components and methods provide controlled transmitter power in a wireless communication system in which both dedicated and shared channels are utilized. A network unit preferably has a receiver for receiving UL user data from WTRUs on UL DCHs and at least one UL SCH and a processor for computing target metrics for UL DCHs based on the reception of signals transmitted by a WTRU on an UL DCH associated with an UL SCH usable by the WTRU. A shared channel target metric generator is provided that is configured to output a respective UL SCH target metric derived from each computed UL DCH target metric. Each WTRU preferably has a processor which is configured to compute UL DCH power adjustments for an UL DCH associated with an UL SCH as a function of UL DCH target metrics computed by the network unit based on the reception of signals transmitted by the WTRU on the UL DCH and UL SCH power adjustments for the associated UL SCH as a function of the respective UL SCH target metrics output from the shared channel target metric generator. Preferably, the target metrics are target signal to interference ratios (SIRs).

What is claimed is: 
     
       1. A wireless transmit receive unit (WTRU) comprising:
 a transmitter configured to transmit on a first channel and a second channel; wherein the second channel is an uplink shared channel; 
 a receiver configured to respectively receive first power commands for the first channel and second power commands for the uplink shared channel; and 
 a processor configured to determine a first channel transmission power level in response to the first power commands and not the second power commands, and to determine an uplink shared channel transmission power level in response to the second power commands and not the first power commands. 
 
     
     
       2. The WTRU of  claim 1  wherein each of the first and second power commands indicate one of a step up or a step down in transmission power level. 
     
     
       3. The WTRU of  claim 1  wherein the uplink shared channel is transmitted sporadically. 
     
     
       4. The WTRU of  claim 1  wherein the first channel is assigned to the WTRU. 
     
     
       5. The WTRU of  claim 1  wherein the first channel is a dedicated channel. 
     
     
       6. A method comprising:
 transmitting, by a wireless transmit receive unit (WTRU), on a first channel and a second channel; wherein the second channel is an uplink shared channel; 
 respectively receiving, by the WTRU, first power commands for the first channel and second power commands for the uplink shared channel; and 
 determining, by the WTRU, a first channel transmission power level in response to the first power commands and not the second power commands, and to determine an uplink shared channel transmission power level in response to the second power commands and not the first power commands. 
 
     
     
       7. The method of  claim 6  wherein each of the first and second power commands indicate one of a step up or a step down in transmission power level. 
     
     
       8. The method of  claim 6  wherein the uplink shared channel is transmitted sporadically. 
     
     
       9. The method of  claim 6  wherein the first channel is assigned to the WTRU. 
     
     
       10. The method of  claim 6  wherein the first channel is a dedicated channel. 
     
     
       11. A network node comprising:
 a receiver configured to receive a first channel and a second channel from a wireless transmit receive unit (WTRU); wherein the second channel is an uplink shared channel; and 
 a transmitter configured to respectively transmit first power commands for the first channel and second power commands for the uplink shared channel; wherein the first power commands are to adjust a transmission power level of the first channel and not the uplink shared channel, and the second power commands are to adjust a transmission power level of the uplink shared channel and not the first channel; 
 wherein the receiver is further configured to receive a transmission power adjusted first channel and a transmission power adjusted uplink shared channel from the WTRU. 
 
     
     
       12. The network node of  claim 11  wherein each of the first and second power commands indicate one of a step up or a step down in transmission power level. 
     
     
       13. The network node of  claim 11  wherein the uplink shared channel is received sporadically. 
     
     
       14. The network node of  claim 11  wherein the first channel is assigned to the WTRU. 
     
     
       15. The network node of  claim 11  wherein the first channel is a dedicated channel.